Means for applying brakes on derailing.



a. A. HUMASON. MEANS FOR APPLYING BRAKES 0N DERAILING.

APPLICATION FILED DEC-26, 1916- 1,219,946. Patented Mar. 20,1911.

UNITED STATES PATENT Prion.

GRANVILLE ADDISON I-IUIVIASON, OF SHREVEPORT, LOUISIANA, ASSIGNOR OF THREE- FOURTHS T0 JAMES W. ATKINS, OF SHREVEPORT, LOUISIANA.

Specification of Letters Patent.

Patented Mar. 20, 1917.

Application filed December 26, 1916. Serial No. 138,752.

To all whom it may concern:-

Be it known that I, GRANVILLE A. HUMA- SON, a citizen of the United States, residing at Shreveport, parish of Caddo, State of Louisiana, have invented a certain new and useful Improvement in Means for Applying Brakes on Der-ailing, and declare the following to be a full, clear, and exact description of the same, such as will enable others skilled in the art to which it pertains to make and use the same, reference being had to the accompanying drawings, which form a part of this specification.

Various expedients have been suggested and tried with more or less success for the purpose of securing an application of the brakes of a train upon the derailment of one of the trucks; but they have all involved valve devices of a kind that may easily get out of order and fail to work in emergency. The object of the present invention is to produce an extremely simple arrangement which, whenever there is sufiicient air pressure in a system to permit an application of the brakes to be made, will operate positively upon the derailment of a truck to cause the brakes to be applied. 7

The various features of novelty whereby the present invention is characterized will hereinafter be pointed out with particularity in the claims; but, for a full understanding of this invention and of its object and advantages, reference may be had to the 7 following detailed description taken in connection with the accompanying drawing, wherein:

Figure 1 is a side elevation of fragments of a railway car with trucks at opposite ends, the wheels of one truck being on the rails and the other truck being derailed;

Fig. 2 is a vertical section through the valve and means for holding it closed;

Fig. 3 is a. side elevation of the valve in its open position; and

Fig. 4c is a bottom plan view of the parts shown in Fig. 3.

Referring to the drawing, 1 and 2 "represent trucks at opposite ends of a railway car and 3 the train pipe of an automatic air brake system. The train pipe is pro vided with an outlet in the vicinity of each of the trucks, closed by a simple cover which is normally held closed by a post or other part connected to the corresponding truck so that when the truck is derailed the support for the cover will be removed andthe pressure in the pipe will blow the cover oft. By making the outlet comparatively large," preferably larger than the cross sectional area of the train pipe, an extremely strong force is available for removing the cover and the latter cannot, by any possibility, stick to its seat.

While the valve device may. take a. great variety of forms, a very cheap, simpleand effective arrangement is that illustrated in the drawing. Thus, in the train pipe adjacent to each of the trucks is placed a T joint, l, one of the openings in which is much larger than the train pipe and serves as the emergency outlet. Into the outlet side of each of the members 4 is screwed a short nipple, 5, at the lower end of which is a packing ring 6. Upon the lower end of each nipple is screwed a sleeve, 7, having downwardly projecting arms, 8, at diametically opposed sides. A valve, 9, in the. form of a simple strong cover plate lies between the arms 8 and is adapted to be seated against the packing ring. The valve is preferably provided with ears, 10, projecting laterally in front of and behind the arms 8 which therefore serve as guides interlocked with the cover and permitting the latter to move up and down without, however, being capa-- ble of disengagement in the lateral direc tion. Between the lower ends of the arms 8 is pivoted an eccentric or cam post, 11, which, in one position, serves to hold the valve pressed tightly against its seat while, in another position, it permits the valveito drop down a considerable distance from its seat. The part 11 has a handle or stem, 12,

projecting radially therefrom; each of the members 11 being connected by a chain or other flexible device, 13, to a rod, 14:, projecting from some portion of the truck frame, to which it is rigidly secured, to a point directly beneath the corresponding valve device.

Normally the parts are in the positions indicated in Fig. 2 and at the left hand side of Fig. 1; the part 11 being in such position that it acts as a strut or post lying between its pivot pin and the under sideof the movable valve member and holding the latter firmly against its seat. In case one of the trucks becomes derailed, there is such a shifting of the truck with respect to the car body that-a pull is exerted upon the chain or other at; I

flexible member of the corresponding emergency device, causing the holder to be swung on its pivot and thus remove the support from beneath the valve or cover. The pressure in the train pipe immediately becomes efi ective to blow the valve or cover outwardly, as indicated at the right hand side of Fig. l and in Fig. 3, thus quickly venting the train pipe.

The part 11, or cam block, is preferably made symmetrical, so that it will function equally well when swung'in one direction as when swung in the opposite direction. Therefore, by placing the outer end of the rod 14 directly beneath the cam block, it makes no difference in which direction the train is going when the truck is derailed because an abnormal relative movement be tween the car body and the truck, in either direction, will result in an application of the brakes.

It will thus be seen that there are no delicate parts or sensitive mechanism that must be caused to act upon the derailment of a truck, nor is there anything that can fail to do its work; all that is required of the truck being that a tiny fraction of the available energy be consumed in removing the support for the valve or cover which is then forcibly removed by the powerful thrust of the air behind it.

Vhile there is illustrated and described with particularity only a single preferred form of the present invention, it is not clesired that this invention be limited to the exact structural details thus illustrated and described; but it is intended to cover all forms and arrangements which come Within the terms of the present invention, constituting the appended claims.

Claims:

1. The combination with the train pipe of an air brake system, of a device having an outlet from said pipe, an inwardly seating cover for said outlet, a movable part pressing against said cover to hold it in an outletclosing position, and a connection between the car truck and said part for causing the latter to release the cover upon derailment of the truck.

2. The combination with the train pipe of an air brake system, of a device connected with said train pipe and having a discharge outlet larger in cross sectional area than that of the train pipe, a cover seating inwardly against said outlet to close the same, a movable support for said cover, and a connection between a car truck and said support for causing the latter to release the cover upon derailment of the truck.

3. The combination with the train pipe of an air brake system, of a device having a discharge outlet tor said pipe, an inwardly seating cover for said outlet, a pivoted cam block supported beneath said cover and having a position in which it presses the cover against its seat and another position in which it permits the cover to drop away from its seat, and a connection between said block and a car truck for causing the block to assume its released position upon abnormal movement between the car body and the truck.

4:. The combination with the train pipe of an air brake system, of a device having a discharge outlet for said pipe, an inwardly seating cover for said outlet, a pivoted cam block supported beneath said cover and having a positio in which it presses the cover against its seat and another position in which it permits the cover to drop away from its seat, and a connection between said block and a car truck for causing the block to assume its released position upon abnormal movement between the car body and the truck in either direction longitudinally oi": the car body.

In testimony whereof, I sign this specification.

GRANVILLE ADDISON HUMASON Copies of this patent may be obtained for five cents each, by addressing the Commissioner of Patents, Washington, D. C. 

